If you are considering whether to buy Lightroom, this Introduction video from my Lightroom course explains the benefits of Lightroom, how it differs from Photoshop, and why you might want to use it.
These are the most common questions I get from photographers about Lightroom, and I hope you find it helpful.
http://www.youtube.com/watch?v=o7wxQ_zBzZA
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My Photography Websites:
SteeleTraining.com Free Photography Tutorials and Online Courses
SteeleVisions.com Personal Photography Site and Blog
BurnMonkey.com Photos from the Burning Man Festival